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How a Transfer Switch Works "It's difficult less protected to run a generator without an exchange switch, however you'll restrict the gadgets that your generator can control," says Dave Trezza, who regulates generator testing for Consumer Reports. "An exchange switch will allow you to control things on your electrical switch board, including designed machines like a water radiator or well siphon." Convenient generators evaluated for 5,000 watts or more can associate with your home's electrical switch board with an exchange switch—a little board that looks somewhat like an electrical switch board itself. (The upside of home backup generators? They have an underlying exchange switch that consequently turns on when the force goes off.) Think about an exchange switch as a little electrical switch board that draws power from your generator rather than the force organization. At the point when electric assistance is out in your space, you plug your conveni